The August LEGO Store calendar, shared by the Brick Fan, reveals that for at least part of August, fans will get the set 5005239 Castle Room free with any Unikitty! purchase at the LEGO Store worth $25 or more. The promotion is expected to also be available at shop.LEGO.com and will likely have a similar spend threshold in the UK and rest of Europe.
A decent image is not yet available, with the lo-res one on the calendar the only chance fans have had to see this set so far. With that caveat, this looks to be similar to 5005358 Minifigure Factory in that a cardboard backdrop makes up the environment, with a few bricks then used to give it some life. Unikitty herself is included in the set, asis a sheet of stickers.